Scriber



May 14, 1946. l.. J. GORDON 2,400,407 f SCRIBER Filed Feb. 1,- 1945l Patented Mey 14, 1946 UNI-TED A sT-Ares PATENT AoFFlcl-z .1 ..f v f" 2,400,407 I l e I scimmiaA l s Y Louis J. Gordon, Chicago, Ill." y Appueatien February 1, 1943, serialNe. 474.246

solenne. (o1. :is- 2n This invention relatesitoV scales or rulers and includes an attachment for a scale or rulerwhereby the scale way be readily adapted. fordrawing circles or radius accurately determined bythe markings von the'scale. e

My attachment includes thefslider whichlis adapted tobe located around `the. scale so that it can be slid longitudinally thereon. Project' ing downwardly from the lower side of my slider,"

is a sharp pointed projection whichis adapted to serve as la center when the yscale is' used in order to accommodate t he opening.It1will of Y course be understood thatthe pencil opening may be locatedatany desired point, other-.than the zero point, in the lengthof the scale, although the opening is preferably. llocated at the zero point, since it' enablesthe radius of the circle toLV be ,more easily'determined with theaid of the markings on the scale.

VMy slider is preferably arrangedwith a straight' upper `edge* in the Ytransverse direction of the scale and this upper edge is in alignment with' theV `centering point, located on the underside of the scale. Y A l Consequently, whentheY slider is placed so that the straight upper edge is on' the 11/2" markyfor example, then the centering point is displaced from the pencil opening by exactly one and onehalf inches. Owing to the co-alignment of the point and the opening in a direction parallelto the length of the scale,A the correspondence of with one edge of thescale and I provide `the pencil opening preferably at the zero point ofthe scale, and with its center Ilocated in alignment with the same edge of the scale. Inlthiscase myscale is provided with an enlargement which extends inwardly of the zero mark `to a slight'ex-l4 tent to provide metal for the formationotthe" pencil opening. This vmodification canv be used: With metal or other non-transparent scales since the centering pointcan be Aviewed from-'abovewhen it is being applied to the paper.

- I prefer to mount on my slider a'protracto'r so arranged that its base line may be brought into alignment with either edge of the scale. This protractor has an arm whereby it is `pivoted on the center line yof the slider. The center of the mounting pivot of this arm is preferably located in' ralignment with'a straight transverse edgeon the upper side of the slider so that the fcenter'o'f the protractor may-be located'exactly above the point at which the straight edge Vintersects the eiective edge of the scale. f

` My scale and the slidervmay be provided with' suitable projections to enable my assembly to be used as kinside andk outside calipers. the pivotalmounting of the protractor, the same may be moved into a suitable position to enable the scale tov beA used for drawing circles or for caliper measurements. Myinvention will more readily be understood from the following description of preferred em-Y bodimentstaken inv conjunction with the accompanying drawing in which:

Figure 1 a perspective'view of a metal scale provided with a slider embodying my invention; Fig. 2 is a perspective View of the underside of l the'a'ssembly;

the spacing between the pencil opening and the Y centering point and the reading of the scale is preserved even in the case of very small circles.

In the case of' scales'oftransparent material,

thec'entering ypoint may be viewedlthroughthe scale 'so that it can be located precisely at the circle.

the `centering Vpointvmay be viewed.l

In one embodiment of my invention locate the'V centering point on v"th'eslider in alignment Fig. 3 is a plan view of a similar assembly employing a scale of transparent material;

Fig. 4 is asectional detail view taken on the line 4 4 of Fig. 3; and

Fig. 5 is a similar View of a modiication of myk reference rnumeral l0 designates a scale which maybe marked inr Vany suitable dimensions, forv 'example inches on one side and centimeters on the other. In rthis 'modification the scale may i suitably be or ste1 er other 'suitable meter Be- YOnd `the ZBIOpoint of the scale I provide an extension I l, one side of which may extend to provide a caliper member IZ; Along kthe zero 1in@ fof; r1.1@` scale I prende .a 'Smau Opening 13%.

Owing to which is adapted to receive a pencil point for the purpose of drawing circles.

Slidably mounted on the scale is a slider I4 which has a snug sliding t thereon. This slider may suitably be formed of metal and it is provided at one end on its upper side with a thumb piece I5 whereby it may be adjusted to desired position along the scale. The thumb piece I5 is preferably formed With ridges I6 to provide nonslip engagement with-thethumb. f f

On its underside theslider I4 is provided with a tongue I'I which is arranged to provide desired friction between the slider and the scale. tongue may suitably be formed by cutting or stamping out a portion of the metal constituting the lower part of the slider and this tongue is curved upwardly slightly as shown in give the desired degree of friction.

The upper side of the slider I4 is formed lwith a straight edge I8 arranged at right angies'to the' length of the scale.. The underside of the scale is preferably formed with a straight edge I9 in alignment with the straight edge I8. v Y On the lower side of the scale I formv a centering projection 2B with apoint which is' in align. ment with-thestraight edge I8. Consequently, when I locate the straight-edge I8 at a definite position on the scale, the centering pointl'has its pointed end located at the indicated distance from the zero point of the scale.

The pencil opening I3 is located exactly in` longitudinal alignment with the point` 20 so that the distance between the center ofthe openingl I3 and the point 20 lies in the longitudinaldirection of the scale and is exactly equal to .the Ydistance indicated by the straight edge I8 on the indicia of the scale. This relation remains true even if the distance becomes very sma11. o

Asshown in Figs. 1 and 2, I provide a lfmgi-v tudinal slot 2 I along the major length of tlielscahle` and in alignment with the point 2so that-this point may be viewed through ,the slot 2| whenever it is being applied to a center point Von the paper. The slot.2I terminates short of the-opening I3, so that this `opening can .be used for the reception of a pencil. f

At one edge of the; slider I4 I'preferto provide a caliper member 22 in alignment with the caliper member I2. The near sides of the caliper members I2 and l22 may be .arranged in alignment with the zerol line of the scale and with the straight edge I8 so thatthe straight edge I8 may be used for reading Ythe vcaliper distances. The members I2 and 22 may suitably have a' combined thickness of an exact amountfor example 1/ 8", so that an outside caliper distance may be computed by merely adding 1/3 tothe reading on the scale indicated by the straight edge I8. i

At the center of the straight edge I8, and in alignment with the center of thescale, I provide on the slider I an ear 23 whereby I pivotally mount an arm 24 whichextends inwardlyfro-m the center of the base of a protractor 25. Thev arm 24 is of sufficient length so that the protractor may be swung from one side tothe other, as shown in Fig. 3, so asV to bring the base 'of the protractor in alignment-'with either edge of the' scale I0. K y y Abutments' 2E on the upper sidejof the jslider I4 are arranged to engage the protractori'sojas" to define these' ltwo positions accurately.l Thel scale and in alignment with the straight edge I8.V

Consequently, the two operative positions of the protractor locate the center point of the protractor at the intersection of the edge I8 with the adjacent edge of the scale I0.

To use the protractor, one edge of the scale is laid along a base line and moved therealong to bring the straight edge I8 in alignment with the point of origin of the angle on the base line. The protractor is then swung around its pivot so as to bring the base of the protractor into alignment witlifsaidbase lineandthe desired angle is marked on the paper. The scale may then be used to join the point of origin to the point of marking.

In order that the lug 23 may not obscure the draftsmans view of the point 20, the point 20, the

opening I3 and the slot 2| are located to one side of the center of the scale as shown in Figs. 1

and 2.

'In the modication illustrated in Fig. 3, a transparent scale is employed and consequently it is unnecessary to provide aislot such as the slot 2| shownin Figs. 1 and 2. v y

In'the embodiment shown in Fig. 5, the center of the pencil opening I3 is located in alignment with one edge of the scale IU andin alignment with the zero line on the scale, this opening being located within an extension. 21 of the scale, which extension extends inwardly' of the .zero mark and beyond' said edge of the'scale.

V.The centering point 20 is located in alignment with the straight edge I8 and in alignment with said edge-'of the scale so that the pencil opening I3 and the centeringpoint 20 lie in longitudinal alignment relative to the length of the scale. In thi's'embodiment the point 20 Vcan be seen from aboveand it vmay be readily located at the desired circle center. I

For the purpose of drawing circles1 vthe operation is the same in all embodiments. The slider I4 is moved alongthel'scale by means of the thumb piece I5 until the straight edge I8 registers with the reading onlthe scale' corresponding to the desired radius. The pointv 20 is then applied to the desired center of the circle and the the scale is then swung around the centering point 2|] until the circle or the desired arc is completed by the pencil.

Although my invention hasl been described in connection with specific details of apreferred embodiment thereof, it must be understood that such details are not intended to be limitative of the invention except in so far as set forth in the accompanying claims.

I claim:

l. In combination, a' scale, a slider slidably mounted thereon, said slider having a straight edge whereby it may be located in denite position relative'to said scale, a centering point on said slider projecting downwardly therefrom, said point being in alignment with said straight edge, said scale having a pencil jopening at a definite position on said scale' and in longitudinal alignmentl `with said centering point, lsaid centering point' being visible'from the vupper side of said otalmounting on said slider so as to be swung into positions fwith its base inalignment with each edge of said scale, saidpivotal mounting being in alignment with said straight edge, and said centering` pointfa'nd opening being displaced from the center of the scale out Vof alignment with said pivotal mounting whereby the protractor can be moved into position to permit viewing of said centering point.

2. In combination, a scale, a slider slidably mounted thereon, said slider having a straight edge whereby it may be located in denite position relative t said scale, a centering point on said slider projecting downwardly therefrom, said point being in alignment with's'aid straight edge, said scale having a pencil opening at a deinite position on said scale and in longitudinal alignment with said centering point, said scalehaving a longitudinal slot in alignment with said center ing point whereby said centering point may be viewed through said slot kfrom the upper side of said scale, and a protractor having an arm pivoted to a point on said slider in alignment with said straight edge and with the longitudinal center line of the scale, said arm being of suiiicient length to permit the protractor to be swung with its base in alignment with either edge of the scale, said centering point, pencil opening and slot being displaced from the longitudinal center line of the scale to permit the protractor to be moved clear of said slot. j

3. In combination, a scale, a slider slidably mounted thereon, said slider having a straight edge wherebyit may be located in denite posi-V said scale, and a protractor having an arm pivoted to a point on said slider in alignment with saidstraight edge and with the longitudinal center line of the scale, said arm being of suicient length to permit the protractor to be swung with f its base in alignment with either edge of the scale,

and abutment means on said slider arranged yto engage the protractor on both said positions, said centering point, pencil opening and slot being displaced from the longitudinal center line of the scale to permit the protractor to be moved clear of said slot.

4. ,In combination, a scale, a slider slidably mounted thereon, a protractor having an arm pivoted to said slider at a point in alignment with the longitudinal center line' of Said scale, said arm being of sufficient length that the protractor can be swung into two positions with its base line in alignment with either edge of said scale, and abutment means arranged to be eng-aged by said protractor in both said positions.

5. In combination, a' scale, a slider slidably mounted thereon, a protractor vhaving an arm pivoted to said slider ata point in alignment with tionrelative to said scale, a centering point 'on said slider projecting downwardly therefrom, said point being in alignment with said straight edge, said scale having a pencil opening at av definite position on said scale and in longitudinal align-v ment with said centering point, said scale having a longitudinal slot in alignment with said centering point whereby said centering point may be viewed through said slot from the upper side of Y rthe longitudinal center line of said scale, saidarmbeing of suiiicient length that the protractor can beswung into two positions with its base line in alignment with either edge of said scale, labutment means arranged to be engaged by said prol tractor in both said positions, and means on said slider in transverse alignment with the pivotal center of said protractor arranged to intersect the edge of the scale at the position occupied by the center of the protractor in either of said positions.

` LOUIS J. GORDON. 

